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Browse by Category: Main > Material Science
Class Information
Number: 523/164
Name: Synthetic resins or natural rubbers -- part of the class 520 series > Synthetic resins (class 520, subclass 1) > Processes of preparing a desired or intentional composition of at least one nonreactant material and at least one solid polymer or specified intermediate condensation product, or product thereof > Lead pencil or marking crayon composition or process of preparing
Description: Subject matter wherein a composition having utility as the writing material in a lead pencil or crayon composition is claimed or solely disclosed or to processes of preparation thereof.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8703231 Lead for painting and method of painting with a lead Apr. 22, 2014
8648128 Writing substance for writing, drawing and/or painting tools Feb. 11, 2014
8431632 Crayon Apr. 30, 2013
8362109 Pencil lead for writing, drawing and/or painting devices Jan. 29, 2013
8299143 Crayon and process for producing the same Oct. 30, 2012
8242190 Crayon and process for producing the same Aug. 14, 2012
7943684 Process for production of black crayon May. 17, 2011
6815471 Erasable colored pencil lead Nov. 9, 2004
6623197 Water-based solid marking composition, method for producing the same, and water-based marking instrument containing the same Sep. 23, 2003
6316526 Method for making leads for color pencils, cosmetic pencils and colored chalk Nov. 13, 2001
6271286 Erasable colored pencil lead Aug. 7, 2001
6262143 Erasable colored pencil lead Jul. 17, 2001
6174938 Water-based coloring compositions containing submicron polymeric particles Jan. 16, 2001
6043298 Solid fritted bonding material Mar. 28, 2000
6011084 Erasable colored pencil lead Jan. 4, 2000
5965657 Air stable adhesive stick Oct. 12, 1999
5919858 Erasable inks Jul. 6, 1999
5801215 Baked pencil lead and method for manufacturing the same Sep. 1, 1998
5733482 Baked color pencil lead manufactured by impregnation with perhydropolysilazane and heat treatment Mar. 31, 1998
5604268 Glue crayons Feb. 18, 1997
5599853 Erasable inks Feb. 4, 1997
5595700 Non-baked color pencil leads and method for preparing same Jan. 21, 1997
5591796 Pumpable anti-abrasion ink additives and printing inks containing such additives Jan. 7, 1997
5591787 Hard lead for a pencil Jan. 7, 1997
5529615 Marking material and method for suspending pigment particles Jun. 25, 1996
5449399 Blendable writing instrument Sep. 12, 1995
5430075 Baked pencil leads and method for preparing same Jul. 4, 1995
5389717 Erasable marking composition Feb. 14, 1995
5346930 Rigid fiberboard Sep. 13, 1994
5336306 Water soluble coloring compositions containing sparkle components Aug. 9, 1994
5331023 Pressure-sensitive crayon adhesive Jul. 19, 1994
5300538 Solid marking compositions Apr. 5, 1994
5261952 Solid marking composition containing glitter Nov. 16, 1993
5147457 Correction stick Sep. 15, 1992
5084493 Water soluble crayon compositions Jan. 28, 1992
5055498 Plastic crayon Oct. 8, 1991
4990013 Glitter crayon Feb. 5, 1991
4853167 Method for making lead pencils and colored pencils Aug. 1, 1989
4768987 Toy automobile having a body formed by a composition for writing Sep. 6, 1988
4689403 Disazo pigment from condensation of carboxylic acid chloride with 2,5-dichloro-1,4-phenylene diamine Aug. 25, 1987
4668572 Pencil lead composition with magnesium oxysulfate fibrous material May. 26, 1987
4639475 Adhesive stick and a process for its production Jan. 27, 1987
4382819 Drawing and coloring element in form of blackboard-chalk-like stick for producing pictures that can be fixed through application of heat May. 10, 1983
4371632 Compositions, processes, and writing elements employing resins of the thermosetting type Feb. 1, 1983
4298507 Flexible marking composition for pencils Nov. 3, 1981
4229334 Plastic modified writing compositions Oct. 21, 1980
4212786 Crayon compositions Jul. 15, 1980
4193906 Compositions for solid writing materials and writing implements Mar. 18, 1980
4176978 Pencil sheath and composition therefor Dec. 4, 1979
4098738 Image developing means Jul. 4, 1978

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